Do you suffer from a lack of stamina?
Do you have pale, skinny legs and a 1x10 drivetrain?
Does your significant other with XO1/XX1 point and laugh at your diminutive 36t cog?
If you answered yes to any of the above questions, here's your $90 solution.
|What comes in the bag: 40t, 16t, spacer, and sticker|
I tired out a 42t cog at first. I really liked the low gear and put a good number of miles on it, but there were some downsides. First, my XT derailleur was pretty well maxed out on B tension. This significantly slowed shifting in the higher gears and I had a few slips of the chain when really laying on the pedals. (I've heard Sram X9/X0 is better for the 42t hack) Second, you've got to drop a lesser cog to create space for the larger cog. Typically, you're going to drop the 17t or maybe 15t. This gives you a pretty good gap in gearing and overall cog size with 13-15-19 or 13-17-19. I tried with both the 15 and 17 out. Shifting sucked. In addition, the change in gearing was too large. It'd be too high or too low to remain efficient. I tried placing a 16t cog from a road cassette in place of the 17 and 15. Shifting was even worse.
I went back and forth, taking the cog off and putting it back on again. The gear was great, the overall performance was not. I was bummed. I was looking for things in my closet to sell so I could just go 11speed.
Then OneUp popped out the 40t. Followed shortly by a correctly ramped 16t cog. Hope returned. I stopped setting up my yard sale. I placed an order.
|The removed 17&15t cogs|
|Words to live by|
Setup for the 40t doesn't require the use of a longer B limit screw like the 42t did. There is even quite a few threads still showing. Chain wrap on my 11t cog losses one tooth of engagement. So far everything is looking good. Time for a ride.
Having now put ~200miles on my 40/16t setup, I'm confident in saying it is a huge improvement over my previous 42t. All my gripes with the 42t setup are cured by the 40/16 combo.
Shifting up and down the ENTIRE cassette is much more smooth. There is still a tiny bit of hesitation going up 13-16-19 if you are trying to make the shift under a high load, but it is far superior to the 15-19 jump. The change in cadence from 19-16-13 is much better, as well. Having ridden 40miles on the road in training and to/from the trails, I can say the gearing jumps are only noticeable on the road. Once on the trail, it's a non-issue.
I haven't had any problems with chain slippage, even when pushing out 1000+ watts.
I've not had one instance of the chain dropping down the cassette while back pedaling.
A 42t is a noticeably lower gear than the 40t, but 40t is still much better than 36t. My current 36 ring/40t is lower than the 34 ring/36t I had previously.
Shifting isn't as good as stock, but it is more than acceptable. Even for racing use.
That's really about it for any issues.
OneUp Component's 40/16 combo is awesome. I'll be happily using it to save energy on races from Colorado to Whislter, BC.